Improved apparatus for heating glue



' UNITED STATES PATENT OEEICEO ROBERT JAOKMAN, OF NEW YORK, N. Y.

IMPROVED APPARATUS FOR HEATING GLUE.

Specification forming part of Lctters Patent No. 43,774. dated August 9, 1864.

To (LZZ whom it may concern:

Be it known that I, RoBEu'r JACKMAN, of the city and county of New York, inthe State ot' New York, have invented a certain new and useful improvement in Apparatus for Heating Glue; and I do hereby declare that the following is a full and exact description of the construction and operation of thesame.

The accompanying drawings form a part of this specification. Figure l is a central longitudinal section, and Fig. 2 is a plan view.

Similar letters of reference indicate like parts in both the figures.

in manufactories of furniture, piano-fores, and the like, where steampo wer is used, steam has long been employed to heat the glue; but the means were imperfect. It is frequently required to heat the glue rapidly, and it is obviously desirable that it should be effected as economically as possible and in a manner which will accomplish other desirable ends.

The apparatus in common use allows steam to fill a coil or a great number of convolutons ot' pipe in the bottom of a suitable bath of water, and the glue-kettles are set partially immersed in this` water. This maintains a reasonably uniform temperature after the glue is melted, but fails to heat the glue with rapidity in the morning, unless the coils of pipe are very extensive, and in thelatter case it involves a veryT considerable expense in its construction. The steam condensing in the coils has also been a source of difficulty, especially in mornings, when the tank is cold and the condensation is very rapid. rlhe water in the tank, by becoming dirty and evaporating, requires constant attention and considerable labor in replenishing. My apparatus avoids these difficulties. Itis ofsimple construction, and involves a smaller first cost, and while it has no parts to rust out, like the coils above described, it heats the glue much more rapidly when necessary, keeps the water of uniform level without requiring attention, and furnishes a supply of the best water to dilute or thin the glue from time to time as required. It also admits of the use ot' cocks by which all the water may be drawn ott' on Saturday nights in winter, to avoid strains from frost, without requiring any labor in effecting this or in refilling it on Monday, and allows pure water to be drawn out in any'quantities desired for other glue apparatus-such as the ordinary double kettles carried about the shopor for other purposes, andall without involving any labor in resupplying the tank.

My apparatus admits the steam directly into the tank, and its condensation there heats the water and adds to its quantity, so that dis tilled water at 2120 Fahrenheit always fills the tank up to the level of the overflow-outlet, except for a brief period after it has been drawn out for some other purpose. It is regulated by the simplest means, so as to receive and condense large volumes of steam in getting up the heat to start the work,.and to waste but. an almost imperceptible quantity of steam or water through the discharge-pipe after the heat is attained.

To enable others skilled in the art to make and use my invention, I will proceed to describe it 'by the aid of the drawings and of the letters of reference marked thereon.

A A A A is a hollow tank orV case of iron, which I prefer to cast in one piece by coring the interior, in a manner well known to foundr=, so as to have the two sides, two ends, the bottom, and the top all a single casting. Its top is adapted to receive the glue-kettles B B, Sto., in holes provided therein, so as to allow them to extend down in the interior nearly to the bottom..

C is a pipe from the steam-boiler, having a bend above the level of the case A, as represented, and opening into the case or tank A near the bottom, so as to discharge steam into and allow it to 'rise through the water.

I) is an overiiow-oritice through which the surplus water is free to esca-pe through the waste-pipe E. The water is indicated by M. A regulating-cock, C', is introduced at or near the bend in the pipe O, by touching which the discharge of steam through the pipe C into the water M may be variedat pleasure.

G is a cock through which hot distilled water may be drawn from the tank A so long as any remains therein, and the water thus taken away may be used in the glue-kettles B to compensate for the evaporationl therefrom, as also to meltfresh glue, and for any other uses.

H is acock through which all thewater may be discharged at pleasure to empty the tank A, taking care tirst, ofcourse, to shut the steam-cock C tightly.

Operation: Suppose my tank A A is empty and cold, and it is desired to heat the glue rapidly to commence Work. I open the cock C and allow the current of steam to lill the tank or case A, the same being applied directly to the bottoms and sides of the glue-kettles B. These kettles I prefer to make of thin copper. The heat of the steam is rapidly absorbed by them and. by the metal of the vessel A, while the steam drives out the contained air from A. I now partially close the cock C', and afterward close it still farther, as the heating progresses, until after a few minutes the tank A will have collected a considerable quantity of pure distilled water oy the condensation of the steam. This Water immerses the lower extremities of the kettles B, and While it serves in the ordinary manner as a reservoir or fund of heat, and as a medium for supplyingit to the glue, it is also available to thin the glue in and or all of the ketilss. Ina very brief period the glue in all the small letllrs will be ready for use. The cock C may now be very nearly closed, and the apparatus may be left to take care of itself. The steam will issue gently and in very small quantities from the pipe C, and Will rise through the Water M, filling all the vacant space in the interior of the tank or case A. It' any surplus exists, it Will flow partially down the Wastelpipe E before it is all condensed. If there is a slight escape of steam through the joints around the kettles B, it is of advantage in saturating the a-ir at that locality, and preventing the glue in the kettles from drying up so rapidly and requiring thinning so often as it otherwise would. I usually make the central kettle larger and store in it a considerable stock of glue of proper consistency to replenish the other kettles. I support the tank or ca'seAA on legs or on a suitable frame of metal or wood. I prefer to also envelop the Whole or a portion of the exterior of the tank or case Al With wood, in order to check the escape of heat by radiation. I prefer to make the case A ot' cast-iron, in a single piece, and mount it in a box of pine, with stout pine legs 5 but it may be made entirely or partly of wood, boiler-iron, or thin sheet metal, if preferred. I can extend the end of the pipe C into the case A a considerable distance and perforatc it, in which case the fresh steam will be more evenly distributed in the Water M, and I can similarly extend the pipe E into the case A and perforate it, in which case, or by the use of an ordinary strainer, I can diminish the chances of the outlet becoming accidentally clogged by chips or thelike; but I have not found such additions necessary.

Having now fully described my improved apparatus, what l claim as new, and desire to secure by Letters Patent, is as follows:

rA glue-heating apparatus adapted {to apply steam directly to the Water in Which the kettles are immersed, and to su ppl-y aliberal quantity ot' distilled Waterwhen required, substantially in the manner and for the purposes herein set forth. l

ROBERT JAGKNIAN.

Vlfitnesses:

THOMAS D. S'rn'rsoN, D. W. S'rmsoN. 

